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Date: Tue, 10 Dec 2013 17:22:39 -0800
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: tytso@....edu, darrick.wong@...cle.com
Cc: linux-ext4@...r.kernel.org
Subject: [PATCH 39/74] e2fsck: remove uninit block bitmap calculation
Since libext2fs now detects a BLOCK_UNINIT group and calculates the
group's block bitmap, we no longer need to emulate this behavior in
e2fsck. We can simply compare the found block map against the
filesystem's, and proceed from there.
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
e2fsck/pass5.c | 103 +++++++-------------------------------------------------
1 file changed, 12 insertions(+), 91 deletions(-)
diff --git a/e2fsck/pass5.c b/e2fsck/pass5.c
index 498c041..6d7b968 100644
--- a/e2fsck/pass5.c
+++ b/e2fsck/pass5.c
@@ -326,7 +326,6 @@ static void check_block_bitmaps(e2fsck_t ctx)
int fixit, had_problem;
errcode_t retval;
int csum_flag;
- int skip_group = 0;
int old_desc_blocks = 0;
int count = 0;
int cmp_block = 0;
@@ -378,9 +377,6 @@ redo_counts:
had_problem = 0;
save_problem = 0;
pctx.blk = pctx.blk2 = NO_BLK;
- if (csum_flag &&
- (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT)))
- skip_group++;
for (i = B2C(fs->super->s_first_data_block);
i < ext2fs_blocks_count(fs->super);
i += EXT2FS_CLUSTER_RATIO(fs)) {
@@ -411,15 +407,11 @@ redo_counts:
actual_buf);
if (retval)
goto no_optimize;
- if (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT))
- memset(bitmap_buf, 0, nbytes);
- else {
- retval = ext2fs_get_block_bitmap_range2(fs->block_map,
- B2C(i), fs->super->s_clusters_per_group,
- bitmap_buf);
- if (retval)
- goto no_optimize;
- }
+ retval = ext2fs_get_block_bitmap_range2(fs->block_map,
+ B2C(i), fs->super->s_clusters_per_group,
+ bitmap_buf);
+ if (retval)
+ goto no_optimize;
if (memcmp(actual_buf, bitmap_buf, nbytes) != 0)
goto no_optimize;
n = ext2fs_bitcount(actual_buf, nbytes);
@@ -429,73 +421,7 @@ redo_counts:
goto next_group;
no_optimize:
- if (skip_group) {
- if (first_block_in_bg) {
- super_blk = 0;
- old_desc_blk = 0;
- new_desc_blk = 0;
- ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
- &old_desc_blk, &new_desc_blk, 0);
-
- if (fs->super->s_feature_incompat &
- EXT2_FEATURE_INCOMPAT_META_BG)
- old_desc_blocks =
- fs->super->s_first_meta_bg;
- else
- old_desc_blocks = fs->desc_blocks +
- fs->super->s_reserved_gdt_blocks;
-
- count = 0;
- cmp_block = fs->super->s_clusters_per_group;
- if (group == (int)fs->group_desc_count - 1)
- cmp_block = EXT2FS_NUM_B2C(fs,
- ext2fs_group_blocks_count(fs, group));
- }
-
- bitmap = 0;
- if (EQ_CLSTR(i, super_blk) ||
- (old_desc_blk && old_desc_blocks &&
- GE_CLSTR(i, old_desc_blk) &&
- LE_CLSTR(i, old_desc_blk + old_desc_blocks-1)) ||
- (new_desc_blk && EQ_CLSTR(i, new_desc_blk)) ||
- EQ_CLSTR(i, ext2fs_block_bitmap_loc(fs, group)) ||
- EQ_CLSTR(i, ext2fs_inode_bitmap_loc(fs, group)) ||
- (GE_CLSTR(i, ext2fs_inode_table_loc(fs, group)) &&
- LE_CLSTR(i, (ext2fs_inode_table_loc(fs, group) +
- fs->inode_blocks_per_group - 1)))) {
- bitmap = 1;
- actual = (actual != 0);
- count++;
- cmp_block--;
- } else if ((EXT2FS_B2C(fs, i) - count -
- EXT2FS_B2C(fs, fs->super->s_first_data_block)) %
- fs->super->s_clusters_per_group == 0) {
- /*
- * When the compare data blocks in block bitmap
- * are 0, count the free block,
- * skip the current block group.
- */
- if (ext2fs_test_block_bitmap_range2(
- ctx->block_found_map,
- EXT2FS_B2C(fs, i),
- cmp_block)) {
- /*
- * -1 means to skip the current block
- * group.
- */
- blocks = fs->super->s_clusters_per_group - 1;
- group_free = cmp_block;
- free_blocks += cmp_block;
- /*
- * The current block group's last block
- * is set to i.
- */
- i += EXT2FS_C2B(fs, cmp_block - 1);
- bitmap = 1;
- goto do_counts;
- }
- }
- } else if (redo_flag)
+ if (redo_flag)
bitmap = actual;
else
bitmap = ext2fs_fast_test_block_bitmap2(fs->block_map, i);
@@ -514,14 +440,15 @@ redo_counts:
*/
problem = PR_5_BLOCK_USED;
- if (skip_group) {
+ if (ext2fs_bg_flags_test(fs, group,
+ EXT2_BG_BLOCK_UNINIT)) {
struct problem_context pctx2;
pctx2.blk = i;
pctx2.group = group;
- if (fix_problem(ctx, PR_5_BLOCK_UNINIT,&pctx2)){
- ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);
- skip_group = 0;
- }
+ if (fix_problem(ctx, PR_5_BLOCK_UNINIT,
+ &pctx2))
+ ext2fs_bg_flags_clear(fs, group,
+ EXT2_BG_BLOCK_UNINIT);
}
}
if (pctx.blk == NO_BLK) {
@@ -575,16 +502,10 @@ redo_counts:
group ++;
blocks = 0;
group_free = 0;
- skip_group = 0;
if (ctx->progress)
if ((ctx->progress)(ctx, 5, group,
fs->group_desc_count*2))
goto errout;
- if (csum_flag &&
- (i != ext2fs_blocks_count(fs->super)-1) &&
- ext2fs_bg_flags_test(fs, group,
- EXT2_BG_BLOCK_UNINIT))
- skip_group++;
}
}
if (pctx.blk != NO_BLK)
--
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